Formulation and method for inhibiting carbon-based deposits
a carbon-based deposit and formulation technology, applied in the direction of hydrocarbon oil treatment, corrosion prevention, thermal non-catalytic cracking, etc., can solve the problems of increasing process downtime, compromising process efficiency, and increasing the accumulation of carbon-based deposits, so as to prevent the build-up of carbon-based deposits
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example 1
Preparation of the Formulation and Treatment Protocol
[0173]In oil industry, internal coke deposits in tubes are a common problem as they restrict flow to the extent where processes shut down. This is illustrated in FIG. 1a and FIG. 1b.
[0174]FIG. 2a shows the general flow chart describing the steps of the disclosed method and starts with the formulation of the chemical solution, followed by carrying out chemical polishing (CP). This is done by filling the pipe (or tube) with the formulation and the method finishes off by characterizing the treated pipe via an oil encapsulation test, a microscopic examination and an analysis of the used oil samples. This has been described above under detailed description of FIG. 6.
[0175]FIG. 3a provides a schematic drawing of the experimental setup. The experimental setup contains the inlet for the chemical polishing solution, a flow control valve, a flow meter, a liquid pump, the pipeline being treated with the chemical polishing solution and a ves...
example 2
Impact of Formulation on the Microstructure of the Internal Surface of a SS321 Tube
[0205]The SS321 surface, in particular the interior wall of SS321 tube (¼″), has been used as the typical substrate to investigate chemical polishing effect. As observed from the SEM in FIG. 8a, there are numerous structure defects on the internal surface of SS321 tube. They were left from the cold drawing process used to manufacture metal tubes. The surface composition analysis (XPS) revealed that the surface is covered by a thick oxide layer. Contrary to this, the surfaces obtained after polishing using LHC solution (FIG. 8b and FIG. 8c) displayed different microstructures. A dense topography with irregularly oriented domains that assemble as spherulites (labelled by dash circle) and each domain contains a ridge was observed under the SEM. With the use of a chelating agent (e.g. etidronic acid), individual domains are converted to thin stripes assembling in parallel in a spherulite. This microstruct...
example 3
Examining the Coking-Resistance of the Different Surfaces
[0215]To test the anti-coking capability of the restructured surface by chemical polishing, an oil sample was sealed in the tube and subjected to heating at a designated temperature for a period of time (FIG. 6).
[0216]This design simulates the real situation where lubricant circulation in pipes is stagnant and exposed to the heat soak released from the turbine during shut down. The heat soak can reach as high as 450° F. (232° C.) or 300° C. and can last from about 6 to 12 hours. Two typical protocols have been designed as follow.
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